From 7889681f4a6c2148e1245604bac751a1cae8f882 Mon Sep 17 00:00:00 2001 From: David Ahern <dsa@cumulusnetworks.com> Date: Mon, 13 Jun 2016 17:14:12 -0700 Subject: [PATCH] net: vrf: Update flags and features settings 1. Default VRF devices to not having a qdisc (IFF_NO_QUEUE). Users can add one as desired. 2. Disable adding a VLAN to a VRF device. 3. Enable offloads and hardware features similar to other logical devices (e.g., dummy, veth) Change provides a significant boost in TCP stream Tx performance, from ~2,700 Mbps to ~18,100 Mbps and makes throughput close to the performance without a VRF (18,500 Mbps). netperf TCP_STREAM benchmark using qemu with virtio+vhost for the NICs Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net> --- drivers/net/vrf.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c index 0b5b3c258c2b..e3fc6d32a289 100644 --- a/drivers/net/vrf.c +++ b/drivers/net/vrf.c @@ -1099,6 +1099,20 @@ static void vrf_setup(struct net_device *dev) /* don't allow vrf devices to change network namespaces. */ dev->features |= NETIF_F_NETNS_LOCAL; + + /* does not make sense for a VLAN to be added to a vrf device */ + dev->features |= NETIF_F_VLAN_CHALLENGED; + + /* enable offload features */ + dev->features |= NETIF_F_GSO_SOFTWARE; + dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM; + dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA; + + dev->hw_features = dev->features; + dev->hw_enc_features = dev->features; + + /* default to no qdisc; user can add if desired */ + dev->priv_flags |= IFF_NO_QUEUE; } static int vrf_validate(struct nlattr *tb[], struct nlattr *data[])